1. The processor - It's like $70 more expensive than the I7-980X 6core extreme and it doesn't come with a Heatsink and Fan. They both are basically the same processor according to some of the bench marks I've seen.

2. The OS - You need Windows 7 64 Bit.

3. Graphics Card - I would definately suggest getting a better Graphics card like the radeon 5700 series or 4800 series.

4. Ram - It's alright but you may wanna go for 1600Mhz and possibly the 6gb triple channel stuff by either Corsair or G.skill.

5. Harddrive - It would be nice if you went SSD but not nessecary. I would seriously check out the WD 1tb 6GB/s harddrive or the 2TB seagate 6gb/s harddrive. Both great quality.

If you were to change the following you're looking at a $2000-$2200 system without monitors. Plus you will want to upgrade your PCU as they aren't usually the greatest in prebuilt systems.

Just my suggestions. Building your own computer definately takes a lot of browsing and comparing also checking reviews and stuff. Hopefully my insight helped a bit.

You could probably do a bit better on the graphics cards, while Quadro may be better for professional apps, 256/512MB is a thing of the past and won't work well for large amounts of textures and/or model geometry. You might be better off with a regular gaming card that has more RAM (1 or 2GB GeForce GTX470/480 or ATi Radeon HD5870). The 6 core CPU is nice and generally worth around $1000 alone (for the Core i7 branded one) plus a $200 motherboard, $150 RAM, graphics, case/psu/etc but for the 6 core series (LGA1366) you want triple channel RAM. 4GB of RAM isn't ideal for triple-channel memory controllers as it is a dual-channel set (2 sticks). Go with either 6GB or 12GB as these are sets of 3 (3x2GB or 6x2GB). You will also want Windows 7 64 bit as the 32 bit version can't address more than 4GB of RAM (including memory mapped I/O, graphics RAM, etc) so it is more like 3GB that you can use.

I would strongly recommend building your own (as pretty much anyone here would agree) because you can customize every little thing and get more performance by overclocking.

I would go with a 6-core i7 (or the 4 core, my 930 handles everything I throw at it just fine, don't know if 6 core CPU is really necessary). If you're doing large modeling or editing you may want the extra RAM so consider 12GB, 6GB is plenty for a gaming build and it really depends on exactly how intricate your models are.

I would go with a high end graphics card with at least 1GB RAM. My Radeon HD5870 is good for gaming but a GTX480 might be better for your needs. There are software mods to convert GeForce cards into their Quadro equivalents as they use the same chip with different BIOS/driver features. To be honest a card that powerful shouldn't even need to be a professional workstation card to function adequately.

If you go with the ATI Radeon HD 5 series cards you can use up to 3 monitors on Eyefinity. This feature allows you to use 3 monitors either as individual displays or one extended display and can render full-screen 3D to the extended display across 3 monitors for a widescreen gaming experience (may be useful for other things too). If you do go this route you can get 3 cheaper monitors instead of 2 for even more screen real estate.

My build cost $1600 after everything (including Corsair H50 water cooler) and runs anything I throw at it. I then spent $450 on 3 Dell st2210 monitors for a total of $2050 for an incredible gaming setup. I've used some 3D design applications (mainly game editing stuff like Valve Hammer and Blender) but it renders just fine.

I am starting to think that building would be easier in terms of getting exactly what [i think] i want.

I am curious also if anyone thinks I can do well with something that tops out at $1600? Sucks to be a poor student again. CalcProgrammer, seems like your gaming setup is good. I never do professional-quality realistic renders. I have a friend who's a video game designer with an architecture degree who insists that spending $800 tops will get me everything I need...